As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: LANDING GEAR DOORS NOT CLOSED CAUTION AFTER LANDING GEAR EXTENSION. MAINTENANCE FOUND NOSE LANDING GEAR SENSOR 19GA TARGET LOOSE DUE TO A MISSING FASTENER, INSTALLED FASTENER AND SECURED TARGET PER AMM 32-32-73. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.